Giving evidence, Mr Lucas said he did not recall much of the flight but remembered seeing a naked woman with a man in a Manchester United shirt for a "matter of seconds".

Pogmore made four recordings from the aircraft between 2007 and 2012, including two of people sunbathing naked, one of a couple of naturists and another of his friends having sex in their back garden, the jury was told.

When Mr Lucas, who was in the helicopter for three of the four incidents, was asked if he saw "any of the actual sex" by his defence barrister Paul Greaney QC, he replied: "I did not".

He told the court he had little recollection of what he said at the time he caught a glimpse of the naked woman but said it was along the lines of: "Oh my god, Poggy."

Mr Lucas said he was focused on searching for nuisance motorbikes on waste ground nearby.

Mr Greaney asked: "Did you do anything at all to assist Adrian Pogmore in what he was doing?"